/Engine/Source/Editor/MovieSceneTools/Public/MovieSceneToolHelpers.h
Get the next available row index for the section so that it doesn't overlap any other sections in time.
The next available row index
static int32 FindAvailableRowIndex ( [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * InTrack, [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * InSection, const [TArray](API\Runtime\Core\Containers\TArray)< [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * > & SectionsToDisregard )